Ledger.
Investor · Chicago, IL

Warren Holtsberg

Open Warren in the network graph →
Filings
4
SEC Form D
Connections
52
co-filers
Capital
across filings
Active
Mar 2009
to Mar 2026

Most-connected co-filers (52)

Robert Schultz · Santa Barbara, CA4 sharedMichael T. Tokarz · New York, NY4 sharedJohn Banta · Champaign, IL4 sharedJames J. Foght · New York, NY4 sharedRavishankar K. Iyer · Chicago, IL4 sharedKathryn Burrer Hyer · Chicago, IL4 sharedWilliam Tai · Chicago, IL4 sharedAndrews Capital Management Corporation · Houston, TX2 sharedItzik Cohen · Campbell, CA2 sharedGary Simon · Westwood, MA2 sharedMark Little · Watertown, MA2 sharedMargaret M. Conklin · New York, NY2 sharedJohn F. O'Connor · New York, NY2 sharedVince Vannelli · Campbell, CA2 sharedBronson Lingamfelter · New York, NY2 sharedDavid Mooney · Lincoln, RI2 sharedGlenn J. Hill · NEW YORK, NY2 sharedRichard Balance · Indian Wells, CA2 sharedJohn Regan · CHICAGO, IL2 sharedDavid Rose · New York, NY2 sharedRichard Berenson · WABAN, MA2 sharedJohn Roberts · Austin, TX2 sharedArthur Goldstein · Watertown, MA2 sharedJohn C. Cerulli · Westwood, MA2 shared

Recent filings (4)

CU DIRECT CORPMar 2026 · 18 co-filers$7.0MCU DIRECT CORPDec 2025 · 54 co-filers$21.1MIllinois Emerging Technologies Fund II, LPApr 2010 · 20 co-filers$60.0MIllinois Emerging Technologies Fund II, LPMar 2009 · 20 co-filers$60.0M

Derived from public SEC Form D (Reg D) filings; entities resolved probabilistically. See Warren in the interactive graph →